Federal Reserve's interest rates pledge boosts Wall Street confidence.

(From Guardian Unlimited)

Wall Street bounced back on Tuesday from the worst stock market crash in two years as the US government moved to halt the fall and pledged to keep interest rates near zero until 2013.

It was another wild day on the US stock markets as share prices soared then fell then rose again. At the close, the Dow Jones industrial average was up 430 points, or nearly 4%. It shot up more than 500 points in the last hour, the biggest one-day gain since 23 March 2009.

The rally followed one of the worst days on world stock markets since Lehman Brothers collapsed in 2008, setting off the financial crisis.

Monday's crash came as …